<template>
    <div class="login_container">
        <div class="login_box">
        <!-- 头像区 -->
            <div class="avatar_box">
                <img src="../assets/logo.png" alt="">
            </div>
        <!-- 表单区 -->
            <el-form ref="loginFormRet" label-width="0" :model="loginForm" :rules="loginFormRules" class="login_form">
                <el-form-item prop="username">
                    <el-input v-model='loginForm.username' placeholder="请输入账号" prefix-icon="iconfont icon-user"></el-input>
                </el-form-item>
                <el-form-item prop="password">
                    <el-input v-model="loginForm.password" placeholder="请输入密码" prefix-icon="iconfont icon-3702mima"></el-input>
                </el-form-item>
                <el-form-item class="btn">
                    <el-button type="primary" @click="login">登录</el-button>
                    <el-button type="info" @click='resetLoginForm'>重置</el-button>
                </el-form-item>
            </el-form>
        </div>
    </div>
</template>

<script>
export default {
    data() {
        return {
            // 这是登录表单的数据绑定对像
            loginForm: {
                username: 'admin',
                password: '123456'
            },
            // 这是表单验证规则对象
            loginFormRules: {
                // 验证用户名是够合法
                username: [
                    { required: true, message: '请输入账号', trigger: 'blur' },
                    { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                ],
                // 验证密码是否合法
                password: [
                    { required: true, message: '请输入密码', trigger: 'blur' },
                    { min: 6, max: 10, message: '长度在 6 到 10 个字符', trigger: 'blur' }
                ]
            }

        }
    },
    methods: {
        resetLoginForm() {
            // this 指定的是对象
            // console.log(this)
            this.$refs.loginFormRet.resetFields()
        },
        login() {
            this.$refs.loginFormRet.validate(async valid => {
                if (!valid) return
                const { data: res } = await this.$http.post('login', this.loginForm)
                // console.log(res)
                if (res.meta.status !== 200) return this.$message.error('登录失败')
                this.$message.success('登录成功')
                // 1.将登陆成功之后token，保存到客户端的 sessionStorage中
                // 1.1 项目中除了登录之外的其他API接口， 必须在登录之后才能访问
                // 1.2 token 只应在当前网站打开期间生效 所以将token 保存到sessionstorage中
                console.log(res)
                window.sessionStorage.setItem('token', res.data.token)
                // 2.通过编程式导航跳转到后台主页，路由地址是 /home
                this.$router.push('/home')
            })
        }
    }
}
</script>

<style lang='less' scoped>
.login_container {
    background: #2b4b6b;
    height: 100%;
}
.login_box{
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50% , -50%);
    .avatar_box{
        position: absolute;
        left: 50%;
        transform: translate(-50% , -50%);
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        background-color: #fff;
        img{
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
        }
    }
}
.login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}
.btn{
    display: flex;
    justify-content:space-around;
}
</style>